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Q: codep1150 on 2002 Toyota Highlander

i have check engine light on pulled a code p0161 and dealer specific code p1150 i replaced o2 sensor for first code and still have a code p1150 setting i think it might be a problem with upstream a/f sensor for cyl 2&3 but not sure my scan tool wont access info any info would help thanks
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Are you sure the second code is not a P1155 not P1150.
P1155 is Bank 2 Sensor 1 heater circuit failure, disconnect the sensor key off check for continuity on the two black wires at the sensor itself if they are "open" the heater circuit in the sensor is bad. Common enough problem.
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